Undulatory Stride with ribs (VIDEO) University of Utah This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption An XROMM animation showing how the savannah monitor lizard's gait has two phases: propulsion - when the foot is pushing against the ground; and swing-when the foot is in the air. On the forelimb's propulsion side, the ribs rotate around their costovertebral joints towards the head while on the swing side, the ribs rotate towards the tail. This is the movement that facilitates inhalation and exhalation when the ribs move bilaterally. The reconstructed ribs are here superimposed on an x-ray video of the walking animal. Credit Cieri et. al., Sci Rep (2020) Usage Restrictions Non commercial with attribution License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.